Custom Factory has released a conversion set to build a T-14 Armata mounting a 152mm cannon as its main gun.

A gun with a projectile that “can burn through a meter of steel” was how it was described by a senior Russian official. The weapon referred to may be the 152mm gun that has been rumored as a potential upgrade to the 125mm gun of the T-14 Armata.

Custom Factory’s "Naked Tower" T-14 "Armata" with 152 mm Cannon 2A82 (CF35084) is offered as a polyurethane resin kit in 1/35 scale. It contains six parts to build the prospective turret and gun. This conversion set was designed to be used with the Zvezda T-14 kit (3670).

I don't see the point, yet.
First, we have to see this gun actually installed in a fully operational tank.
Second, we should wait to see the actual rate of fire of such gun, the storage capacity within the Armata due to the larger ammo, and the expected life of the gun.
Only then we can have a real idea about its performance and eventual advantages over the current Russian 125mm gun or Western 120mm ones.
Last but not least, in a tank-to-tank fight the main ammo involved should be APFSDS, meaning a sub-caliber ammunition. If we take a look at live firing experience, this ammo effectivity does not rely on the gun bore caliber but on the chamber size since what defines the projectile velocity -and its armor penetration- is the propellant volume.
I doubt that a significantly bigger gun breech, and thus a gun chamber, can be easily accomodated inside a small turret like the Armata one without affecting the ammo carroussel performance.
Yet to be seen

Conversion for a prototype.
The specific designation for the gun is 2A83.
This "upgunning" of Soviet/Russian tanks has been in the works for quite a while. It started way back in the 1980's when Leningrad and Transmash started Obiekt 292, putting a LP-83 152mm main gun on a T-80BV. Actual test firing did not begin until 1991 and we know what situation the Russian defense industry was in in the 1990's. There was only the 1 prototype.
The PL-83 152mm gun was tested on the obiekt 477 "Molot" prototype tank.
The 2A83 152mm gun, developed from the 2A65 gun on the 2S19 Msta-S artillery piece, was tested on the obiekt 195 "Black Eagle" prototype tank.
The 2A83 has been modified to fit the T-14 turret, but to my knowledge there have been no photos released of this specific prototype. The 1/35 resin conversion, to the best of my knowledge, has to be speculation based on previous obiekt work.
On a side note, the Germans are working on a 130mm gun and us Americans are working on a 140mm gun.
ALL research on larger main guns is very slow/low priority and the priority is to work on lower-cost improvements to existing systems.

Again AFAIK, the German 130mm gun is a 100% private development entirely financed by Rheinmetall.
The last I've read about it was that its total weight is above 3.5 tons, while the current 120mm gun weights 3 tons. The weight of each ammo cartridge is above 30kg with a length of aprox 1.3 meters.
So this gun might be used only with an auto-loader, demanding a new turret design.
I ask myself how many bridges and roads can hold a tank with the resulting total combat weight...
I have no references about a current development of a 140mm gun in the US, at least since 2010. I do not mean that there is no such development in the works, only that I did not find any recent official news about it.
This kind of developments make me think about the sabertooth-tiger evolution...
BTT, as Jacques said, with the current information available this AM gun is more than likely a speculative design.
At least until Custom Factory show actual pictures of the real thing...

Well, I guess I'll hold off then, I have no interest in paper panzers myself. Prototypes, you bet, one of my favorite subjects, they are something different, even if it turned out to be a dead end street. so I guess I will wait for a photo of an actual prototype to surface. Thanks for the info guys!